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soluble and insoluble
Soluble and insoluble substances
Aim: to record the dissolving rate of the different powders.
Hypothesis: This is a statement saying what will happen
some substances (chemicals) are soluble in water.
Materials: p 63
List equipment used test tube and spatula
Chemicals: Copper sulfate, Sodium chloride (salt), Copper carbonate, Sugar, chalk, sand
Method: For assistance see p 63
- Fill half of each test tube with water.
- Add a small amount (less than half of a spatula) of one substance to the first test tube.
- Shake the test tube up and down.
- As you shake the test tube, hold it up to the light. Is it cloudy, or does the light pass through it? Is the liquid coloured or colourless? Record your initial observations.
- All the test tube to stand in the rack for holding them evenly.
- Record your observations in the table below.
- Repeat steps 2-6 for each substance.
Results.
| Mixture | Initial observation | Observations after 5 mins | Type of mixture (solution or suspension) |
| Copper sulfate & water | Particles disappeared; solution turned blue | As before, clear blue | Solution |
| Sodium chloride (salt) & water | Is white coloured mirk | No dissolve shown and white still | Solution |
| Copper carbonate & water | Green dark mirk | Very green and sunk to bottom | Solution |
| Sugar & water
|
Swirling around water | Has dissolved | suspension |
| Chalk & water
|
Has gone very white | Has dissolved | Suspension |
| Sand & water
|
Gone straight to the bottom | Still at bottom and no dissolving yet | Solution |
Discussion Write your answers in full sentences
- What is the difference between a solution and a suspension?
Solutions don’t dissolve and suspensions do.
- List those that formed: (a) a solution 1 and 2 (b) a suspension 3 and 4
Solutions:
Suspensions:
- Did you think you would get different results if you used more or less water in each case? Explain your answer yes because I thought they would mostly be suspensions
Conclusion: My hypothesis was not supported because they were mostly all solutions
science
what we did: we used several different powders as an item to mix in a test tube withwater and had to tell if they were a solution or a suspension
sugar solutions
in science we had to find the amount of sugar cubes that can be dissolved in different tempuratures over the bunson burner.had
here are the results.
30 had 11
40 had 8
50 had 8
60 had 19
70 had 21
80 had 18.5
90 had 11 but could have done more
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